The global warming is believed by many researchers, including the NASA scientists, to be at least partly attributable to human activity, particularly carbon dioxide emissions from fossil fuels. Some of the 1998 anomalies were due to El Niño, but this cannot explain the overall warming trend, says the report. As the Pacific Ocean temperature has returned to a ‘more normal level’, 1999 is predicted to be less warm than 1998, but still well above the long-term average for 1951-80.

See linked report for more details.

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